I'm building out some testing of pNFS SCSI layouts. It would be
convenient to test pNFS on a single host with several qemu VMs, so I am
using LIO's vhost target and presenting that to guests with qemu's
vhost-scsi-pci device.
I've used both a block and fileio backed LUN, and each time I run
bonnie++ on a freshly created XFS in the guest I end up with some kind
of corruption.
I can verify a write pattern on the entire LUN. If I provide the LUN to
the host using an LIO loopback device, it completes the benchmark on the
host.
Any ideas what I am doing wrong, or suggestions to test the LUN's IO
from within the guest to find the problem?
o- /
................................................................................................................
[...]
o- backstores
.....................................................................................................
[...]
| o- block
.........................................................................................
[Storage Objects: 1]
| | o- local_sp4 .....................................
[/dev/fedora-server/scsi_layout_dev (5.0GiB) write-thru activated]
| o- fileio
........................................................................................
[Storage Objects: 1]
| | o- local_file
............................................................. [/lio_file
(5.0GiB) write-back activated]
| o- pscsi
.........................................................................................
[Storage Objects: 0]
| o- ramdisk
.......................................................................................
[Storage Objects: 0]
| o- user
..........................................................................................
[Storage Objects: 0]
o- iscsi
...................................................................................................
[Targets: 0]
o- loopback
................................................................................................
[Targets: 0]
o- vhost
...................................................................................................
[Targets: 1]
o- naa.5001405c3c2282ec
.....................................................................................
[TPGs: 1]
o- tpg1
.........................................................................
[naa.50014057bb822c67, no-gen-acls]
o- acls
.................................................................................................
[ACLs: 0]
o- luns
.................................................................................................
[LUNs: 2]
o- lun0 ..................................................
[block/local_sp4 (/dev/fedora-server/scsi_layout_dev)]
o- lun1
.........................................................................
[fileio/local_file (/lio_file)
I am using libvirt, adding this to my machine's config:
<qemu:commandline>
<qemu:arg value='-device'/>
<qemu:arg
value='vhost-scsi-pci,id=scsi6,wwpn=naa.5001405c3c2282ec,event_idx=off'/>
</qemu:commandline>
Thanks for any help,
Ben
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